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| From | Maarten Buis <maartenlbuis@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | Re: st: xttobit & stata 12: Initial values not feasible |
| Date | Tue, 3 Jul 2012 20:05:09 +0200 |
On Tue, Jul 3, 2012 at 6:07 PM, Surender Komera wrote: > Ok. I'm not sure i got it completely what you are saying. As you see i > don't have any binary variable or any time invariant one as > explanatory variables. All my explanatory variables are ratios and > they are continuous. I didn't clearly get it how i can center them? I do not understand what you do not understand. You can create new variables with -generate-. These new variables will be equal to the old variables minus some number that makes sure that the value 0 is within the range of the data. After that you just add those new variables instead of the old variables. You should not do this with categorical variables, but since you claim not to have them, that is not a problem. The fact that your variables are not time invariant is irrelevant. > I appreciate if you can site some source for reading to understand it clearly. Any introductory text on multilevel modeling will deal with this. > However, do you think it can > potentially offer some solution to my problem of "Initial values not > feasible". As I explained before: yes. -- Maarten -------------------------- Maarten L. Buis Institut fuer Soziologie Universitaet Tuebingen Wilhelmstrasse 36 72074 Tuebingen Germany http://www.maartenbuis.nl -------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/